2,3-trans-3,4-cis-Leucocyanidin 2-(3,4-Dihydroxyphenyl)-3,4-dihydro-2H-1-benzopyran-3,4,5,7-tetrol 3,3',4,4',5,7-Flavanhexol 3,4-Cyanidiol 480-17-1 C05906 Leucoanthocyanidol Leucocianidol Leucocyanidin Leucocyanidol Leukocyanidine Procyanidol Resivit